[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Re: [PATCH] ceph/rbd block driver for qemu-kvm (v3)
From: |
Christian Brunner |
Subject: |
Re: [Qemu-devel] Re: [PATCH] ceph/rbd block driver for qemu-kvm (v3) |
Date: |
Tue, 13 Jul 2010 21:23:38 +0200 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
On Tue, Jul 13, 2010 at 11:27:03AM -0700, Yehuda Sadeh Weinraub wrote:
> >
> > There is another problem with very large i/o requests. I suspect that
> > this can be triggered only
> > with qemu-io and not in kvm, but I'll try to get a proper solution it
> > anyway.
> >
>
> Have you made any progress with this issue? Just note that there were
> a few changes we introduced recently (a format change that allows
> renaming of rbd images, and some snapshots support), so everything
> will needed to be reposted once we figure out the aio issue.
Attached is a patch where I'm trying to solve the issue
with pthreads locking. It works well with qemu-io, but I'm
not sure if there are interferences with other threads in
qemu/kvm (I didn't have time to test this, yet).
Another thing I'm not sure about is the fact, that these
large I/O requests only happen with qemu-io. I've never seen
this happen inside a virtual machine. So do we really have
to fix this, as it is only a warning message (laggy).
Regards,
Christian
0027-add-queueing-delay-based-on-queuesize.patch
Description: Text document